WHFC 0.8.4 and 'no_formatter' error

Hi everybody,
When I try WHFC 0.8.4 with Hylafax-4.0pl1, I receive regularly a
Notify no-formatter error (via e-mail)
The point is that trying to re-send the SAME FAX to the SAME number
succeeds often, or fails again and than the third time it works.
It is thus an intermitted problem.
Hylafax runs on a Linux box and for this test, nobody else is using
this machine (no simultanous FAX access possible)
Anybody with the same problem ?
and even better, a sollution ?
TIA
Alex
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